O vera summa sempiterna trinitas

Source: 
Wellington (New Zealand), The Alexander Turnbull Library - Rare Books, MSR-03
Folio: 
153r
Sequence: 
3
Feast: 
De Trinitate
Office/Mass: 
L
Genre: 
A
Position: 
3
Cantus ID: 
004086
Mode: 
3
Differentia: 
k-k-k-h-j
Differentia database: 
1--k-k-k-h-j-jh--4 371b
Manuscript Reading Full Text (standardized spelling): 
O vera summa sempiterna trinitas pater et filius et spiritus sanctus
Manuscript Reading Full Text (MS spelling): 
O vera summa sempiterna trinitas pater et filius et spiritus sanctus
Indexing notes: 
differentia might be hidden in the margin on the digital image from the library (what is the ending?)